add support for coco json format while exporting annotations for rectangles

[VaibhavSinghWefox]

The idea is to add support for coco json format while exporting annotations for rectangles. I'm more than happy to do a PR.

[github-actions]

👋 Hello @VaibhavSinghWefox, thank you for your interest in make-sense - free to use online tool for labelling photos! 🏷️

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[SkalskiP]

Hi, @VaibhavSinghWefox 👋🏻! Sorry for the late reply. I've been super busy lately. If you want to make the PR, I'm happy to take it :)